JPH053741Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device installed in an intake pipe of an internal combustion engine to inject and supply fuel, and particularly to a support device for a bottom feed type fuel injection valve.

[Prior art]

Conventionally, a bottom feed type fuel injection valve 1 as shown in FIG. 2 has at least two O
The ring 7, 8 was arranged in a body 2 provided in an intake pipe of an engine, and was assembled by being pressed downward in the figure by a cover 3 via an elastic body 6. In this structure, fuel is supplied from a fuel supply passage 4 within the body 2, a portion of which is injected from an injection valve, and the remainder is discharged from a fuel outflow passage 5. In the case of the embodiment shown in FIG. 2, in order to prevent damage to the O-ring 7 due to downward pressing force in the drawing, a stopper portion 10 is provided within the body 2 for vertical positioning of the injection valve.
was provided and brought into direct contact with the injection valve 1. For this reason, there was a problem in that vibrations caused by engine operation were transmitted to the injection valve 1, and the body 2 resonated with the vibrations and produced sound.

Furthermore, since the structure of JP-A No. 58-35266 is a top-feed type injection valve, it covers the entire outer periphery and surroundings of the valve, requiring a large amount of solid vibration damping material, and a bottom-feed type valve requires a large amount of solid vibration damping material. There were some problems where it was not applicable.

[Purpose of invention]

In view of the above-mentioned problems, the present invention can suppress the generation of noise caused by resonance between the bottom feed type fuel injection valve and the body that houses it.
An object of the present invention is to provide a support device for a bottom feed type fuel injection valve that is excellent in quietness.

[Means for solving problems]

In order to achieve the above object, the present invention provides a bottom feed type fuel injection valve 1 which takes in fuel from an intake part formed on the outer periphery of an approximately central part and injects fuel from a fuel discharge part formed at one end. A mounting hole 12 is formed that accommodates the fuel injection valve inserted through an opening on one side and allows the discharge portion of the fuel injection valve to face the opening on the other side, and the mounting hole 12 and the fuel injection valve are connected to each other. a body 2 that supplies fuel to the intake portion of the fuel injection valve with a fuel passage 13 between the body 2 and the fuel injection valve; a cover 3 that fixes the fuel injection valve in a state housed in the mounting hole; and an outer periphery of the fuel injection valve. A sealing member that seals fuel interposed between the mounting hole and the mounting hole,
first and second seal members 7 and 8 provided on both sides of the fuel passage formed between the mounting hole and the fuel injection valve; and the other end of the fuel injection valve and the cover. A first elastic body 6 that is interposed between the two and has vibration damping ability.
an annular filter member 11 provided so as to surround the intake portion of the fuel injection valve; and an annular filter member 11 formed in the mounting hole of the body, which is connected to the filter member in the insertion direction of the fuel injection valve into the mounting hole. The fuel injection valve is provided with an opposing step portion 2a and a second elastic body 9 interposed between the filter member and the step portion and having a vibration damping ability. is pressed by the cover, and the second
A support device for a bottom feed type fuel injection valve is employed, which is positioned in the insertion direction by the stepped portion of the body via the elastic body and the filter member.

〔Example〕

The present invention will be described below with reference to an embodiment shown in FIG. 1 is an electromagnetic fuel injection valve that injects fuel into an intake pipe of an internal combustion engine. A computer calculates an optimal fuel injection amount from output signals from various sensors (not shown), and the energization is controlled at time intervals according to the optimal fuel injection amount. 2 is a body disposed in an intake pipe of an engine (not shown). A mounting hole 12 is formed in the body 2, and the electromagnetic fuel injection valve 1 is housed in the mounting hole 12.
A fuel passage 13, which will be described later, is formed between the mounting hole 12 and the electromagnetic fuel injection valve 1, and this fuel passage 13 includes a fuel supply passage 4 and a fuel outlet passage 5.
is connected. The fuel supply path 4 is connected to a fuel supply pump (not shown), and fuel is pumped from the fuel supply pump to the fuel passage 13 through the fuel supply path 4.

The spaces between the case 14 of the fuel injection valve 1 inserted into the mounting hole 12 of the body 2 and the mounting hole 12 and between the valve body 15 and the mounting hole 12 are held fluid-tight by O-rings 8 and 7, respectively. , these O
Between the rings 8 and 7, the aforementioned fuel passage 13 is formed between the outer peripheral surface of the case 14 and the inner peripheral surface of the mounting hole 12.

A filter 11 is attached to the valve body 15 of the fuel injection valve 1, and the filter 11 is provided with a fuel inlet 11a. Fuel passage 13
The fuel fed under pressure flows into the fuel injection valve 1 through the fuel inlet 11a and is injected into an intake pipe (not shown).

Next, a method of supporting the fuel injection valve 1 will be explained. The fuel injection valve 1 is pressed downward in the figure by a cover 3 fixed to the body 2 via an elastic body 6 such as rubber. An elastic body such as rubber is disposed between the lower surface of the filter 11 attached to the fuel injection valve 1 and the body 2, and the elastic body 9 absorbs the downward pressing force. Therefore, the fuel injection valve 1 is vertically supported by the elastic bodies 6 and 9.

As shown in FIG. 1, the bottom feed type fuel injection valve 1 has an inlet portion 1a covered with a filter 11 at approximately the center thereof, and fuel is supplied from the fuel inlet 11a of the filter 11. Intake part 1
The fuel is introduced into the interior through the fuel injection valve 1, and is injected from the fuel discharge portion 1b formed at one end of the fuel injection valve 1.
Further, the fuel injection valve 1 is inserted into the mounting hole 12 as shown in FIG. 1, and is held and accommodated by the cover 3. Mounting hole 1 as shown in FIG.
2 is an opening 1 at one end into which the fuel injection valve 1 is inserted;
2a, and an opening 12b at the other end through which the discharge portion 1b of the fuel injection valve 1 faces outward. Further, inside the mounting hole 12, a stepped portion 2a is formed which faces the filter 11 in the insertion direction of the fuel injection valve 1. Furthermore, a cylindrical surface 2b that contacts the O-ring 8 is located near the opening 12a of the mounting hole 12.
A cylindrical surface 2c that contacts the O-ring 7 is formed at a position closer to the opening 12b. As shown in FIG. 1, the filter 11 is formed by opening a fuel inlet 11a in an annular frame 11b provided along the outer periphery of the fuel injection valve 1.
A flange portion 11c facing the step portion 2a formed in the mounting hole 12 is enlarged in the radial direction into a disk shape.
Therefore, the fuel injection valve 1 is supported in the radial direction by O-rings 7 and 8, as shown in FIG. Further, the fuel injector 1 is held down by the cover 3 via the elastic body 6 in the downward direction in the figure, and the fuel injection valve 1 is held down by the step portion 2a via the filter 11 and the elastic body 9.
It is pressed down and positioned and fixed in the vertical direction in the figure, that is, in the direction in which the fuel injection valve 1 is inserted.

In the above structure, since the elastic body 9 is disposed within the fuel passage 13 filled with fuel, a material with excellent fuel resistance is used.

Also, attach the brim of the filter 11 to the valve body 1.
5, and the vertical positional relationship between the O-ring 7 and the elastic body 9 may be reversed. In this way, the elastic body can be used even if it is not made of a material with excellent fuel resistance.

Next, the operation of the embodiment of the configuration will be explained. The fuel sent through the fuel supply path 4 flows into the fuel passage 13, and a portion of the fuel flows into the fuel injection valve 1 through the fuel inlet 11a of the filter 11. When the fuel injection valve 1 is energized at time intervals according to an optimum fuel injection amount by an electronic controller (not shown), the valve opens and closes to inject fuel into an intake pipe (not shown). The remaining fuel that has not been injected by the fuel injection valve 1 is discharged from the fuel passage 13 through the fuel outlet passage 5.

[Effect of idea]

According to the present invention described above, the bottom feed type fuel injection valve is accommodated in the mounting hole of the body and is held down by the cover. First and second seal members interposed between the outer periphery of the fuel injection valve and the inner periphery of the mounting hole on both sides of the fuel passage prevent fuel from leaking from the fuel passage. Moreover, the fuel injector is held down by the cover 3 via the first elastic body, and is positioned by coming into contact with a step formed inside the mounting hole via the filter member and the second elastic body. Ru. Therefore, one side of the fuel injection valve is supported by the first elastic body, and the other side is supported by the second elastic body in the direction of insertion into the mounting hole.
is supported by an elastic body and a filter member. Therefore, vibrations transmitted from the engine to the fuel injection valve and vibrations transmitted from the fuel injection valve to the body are effectively damped, and vibrations such as resonance noise are prevented from occurring. In particular, with the configuration of the present invention, by positioning the fuel injector on the body via the second elastic body and the filter member, it is possible to increase the damping effect of vibrations, and also reduce vibration and wear of the filter. This also prevents malfunctions.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the mounting structure of an embodiment of the present invention;
FIG. 2 is a diagram showing an example of a conventional example. 1...Electromagnetic fuel injection valve, 2...Body, 3...
...Cover, 4...Fuel supply path, 5...Fuel outflow path, 6...Elastic body, 7...O ring, 8...O ring, 9...Elastic body, 10...Contact part, 11...
Filter, 11a...Fuel inlet, 12...Mounting hole, 13...Fuel passage, 14...Case, 15...
...Valve body.

Claims (1)

[Claims for Utility Model Registration] (1) A bottom-feed type fuel injection valve 1 that takes in fuel from an intake portion formed on the outer periphery of the approximately central portion and injects fuel from a fuel discharge portion formed at one end. A mounting hole 12 is formed to accommodate the fuel injection valve inserted through an opening on one side and to allow the discharge part of the fuel injection valve to face the opening on the other side, and the mounting hole and the fuel injection valve are connected to each other. a body 2 that supplies fuel to the intake part of the fuel injection valve with a fuel passage 13 between the body 2; a cover 3 that fixes the fuel injection valve in a state housed in the mounting hole; and an outer periphery of the fuel injection valve and the A first sealing member that is interposed between the mounting hole and the fuel injector and is provided on both sides of the fuel passage formed between the mounting hole and the fuel injection valve.
and second seal members 7 and 8; a first elastic body 6 interposed between the other end of the fuel injection valve and the cover and having a vibration damping ability; and the attachment of the fuel injection valve. an annular filter member 11 provided so as to surround the inlet; a stepped portion 2a formed in the mounting hole of the body and facing the filter member in the insertion direction of the fuel injector into the mounting hole; a second elastic body 9 interposed between the member and the stepped portion and having a vibration damping ability; the fuel injection valve is held down by the cover via the first elastic body; A support device for a bottom feed type fuel injection valve, characterized in that the supporting device is positioned in the insertion direction by the stepped portion of the body via the second elastic body and the filter member. (2) The filter member is formed by opening a fuel inlet 11a in an annular frame 11b attached to the outer periphery of the fuel injection valve, and a disc-shaped flange 11c that spreads in the radial direction is formed in the frame. A support device for a bottom-feed fuel injection valve according to claim 1, which is characterized in that: